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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (C) 2022 Raspberry Pi Ltd
*
* Denoise.cpp - Denoise (spatial, colour, temporal) control algorithm
*/
#include "denoise.h"
#include <libcamera/base/log.h>
#include "denoise_status.h"
#include "noise_status.h"
using namespace RPiController;
using namespace libcamera;
LOG_DEFINE_CATEGORY(RPiDenoise)
// Calculate settings for the denoise blocks using the noise profile in
// the image metadata.
#define NAME "rpi.denoise"
Denoise::Denoise(Controller *controller)
: DenoiseAlgorithm(controller), mode_(DenoiseMode::ColourHighQuality)
{
}
char const *Denoise::name() const
{
return NAME;
}
int Denoise::read(const libcamera::YamlObject ¶ms)
{
sdnEnable_ = params.contains("sdn");
if (sdnEnable_) {
auto &sdnParams = params["sdn"];
sdnDeviation_ = sdnParams["deviation"].get<double>(3.2);
sdnStrength_ = sdnParams["strength"].get<double>(0.25);
sdnDeviation2_ = sdnParams["deviation2"].get<double>(sdnDeviation_);
sdnDeviationNoTdn_ = sdnParams["deviation_no_tdn"].get<double>(sdnDeviation_);
sdnStrengthNoTdn_ = sdnParams["strength_no_tdn"].get<double>(sdnStrength_);
sdnTdnBackoff_ = sdnParams["backoff"].get<double>(0.75);
}
cdnEnable_ = params.contains("cdn");
if (cdnEnable_) {
auto &cdnParams = params["cdn"];
cdnDeviation_ = cdnParams["deviation"].get<double>(120);
cdnStrength_ = cdnParams["strength"].get<double>(0.2);
}
tdnEnable_ = params.contains("tdn");
if (tdnEnable_) {
auto &tdnParams = params["tdn"];
tdnDeviation_ = tdnParams["deviation"].get<double>(0.5);
tdnThreshold_ = tdnParams["threshold"].get<double>(0.75);
} else if (sdnEnable_) {
/*
* If SDN is enabled but TDN isn't, overwrite all the SDN settings
* with the "no TDN" versions. This makes it easier to enable or
* disable TDN in the tuning file without editing all the other
* parameters.
*/
sdnDeviation_ = sdnDeviation2_ = sdnDeviationNoTdn_;
sdnStrength_ = sdnStrengthNoTdn_;
}
return 0;
}
void Denoise::initialise()
{
}
void Denoise::switchMode([[maybe_unused]] CameraMode const &cameraMode,
[[maybe_unused]] Metadata *metadata)
{
/* A mode switch effectively resets temporal denoise and it has to start over. */
currentSdnDeviation_ = sdnDeviationNoTdn_;
currentSdnStrength_ = sdnStrengthNoTdn_;
currentSdnDeviation2_ = sdnDeviationNoTdn_;
}
void Denoise::prepare(Metadata *imageMetadata)
{
struct NoiseStatus noiseStatus = {};
noiseStatus.noiseSlope = 3.0; // in case no metadata
if (imageMetadata->get("noise.status", noiseStatus) != 0)
LOG(RPiDenoise, Warning) << "no noise profile found";
LOG(RPiDenoise, Debug)
<< "Noise profile: constant " << noiseStatus.noiseConstant
<< " slope " << noiseStatus.noiseSlope;
if (mode_ == DenoiseMode::Off)
return;
if (sdnEnable_) {
struct SdnStatus sdn;
sdn.noiseConstant = noiseStatus.noiseConstant * currentSdnDeviation_;
sdn.noiseSlope = noiseStatus.noiseSlope * currentSdnDeviation_;
sdn.noiseConstant2 = noiseStatus.noiseConstant * sdnDeviation2_;
sdn.noiseSlope2 = noiseStatus.noiseSlope * currentSdnDeviation2_;
sdn.strength = currentSdnStrength_;
imageMetadata->set("sdn.status", sdn);
LOG(RPiDenoise, Debug)
<< "const " << sdn.noiseConstant
<< " slope " << sdn.noiseSlope
<< " str " << sdn.strength
<< " const2 " << sdn.noiseConstant2
<< " slope2 " << sdn.noiseSlope2;
/* For the next frame, we back off the SDN parameters as TDN ramps up. */
double f = sdnTdnBackoff_;
currentSdnDeviation_ = f * currentSdnDeviation_ + (1 - f) * sdnDeviation_;
currentSdnStrength_ = f * currentSdnStrength_ + (1 - f) * sdnStrength_;
currentSdnDeviation2_ = f * currentSdnDeviation2_ + (1 - f) * sdnDeviation2_;
}
if (tdnEnable_) {
struct TdnStatus tdn;
tdn.noiseConstant = noiseStatus.noiseConstant * tdnDeviation_;
tdn.noiseSlope = noiseStatus.noiseSlope * tdnDeviation_;
tdn.threshold = tdnThreshold_;
imageMetadata->set("tdn.status", tdn);
LOG(RPiDenoise, Debug)
<< "programmed tdn threshold " << tdn.threshold
<< " constant " << tdn.noiseConstant
<< " slope " << tdn.noiseSlope;
}
if (cdnEnable_ && mode_ != DenoiseMode::ColourOff) {
struct CdnStatus cdn;
cdn.threshold = cdnDeviation_ * noiseStatus.noiseSlope + noiseStatus.noiseConstant;
cdn.strength = cdnStrength_;
imageMetadata->set("cdn.status", cdn);
LOG(RPiDenoise, Debug)
<< "programmed cdn threshold " << cdn.threshold
<< " strength " << cdn.strength;
}
}
void Denoise::setMode(DenoiseMode mode)
{
// We only distinguish between off and all other modes.
mode_ = mode;
}
// Register algorithm with the system.
static Algorithm *Create(Controller *controller)
{
return (Algorithm *)new Denoise(controller);
}
static RegisterAlgorithm reg(NAME, &Create);
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